Zipper head assembly structure and sliding assembly thereof

ABSTRACT

The prevent invention provides a zipper head assembly structure and a sliding assembly thereof. The zipper head assembly structure includes a sliding assembly and a pulling member. The sliding assembly has a base portion, a seat portion, a cover sheet, a spring component, and a retaining member. The cover sheet is disposed on the seat portion. The spring component is disposed inside the seat portion and between the cover sheet and the retaining member. The retaining member is movably disposed on the seat portion and movably contacts the spring component. The pulling member is movably mated with the retaining member. The spring component has a first contacting side contacting the retaining member and a second contacting side, and the cover sheet has a first end portion contacting the second contacting side and a second end portion separated from the retaining member.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The instant disclosure relates to a zipper head assembly structure and a sliding assembly thereof, and more particularly to a zipper head assembly structure having a movable retaining member and a sliding assembly thereof.

2. Description of Related Art

In general, zippers are basic elements in clothing or accessories. Compare to buttons, the zippers are easier to use. A conventional zipper comprises a zipper head and a tape. The zipper head works with the tape to allow the pulling action. Recently, the zipper has been used commonly for clothing, pants, backpack, and other accessories.

SUMMARY OF THE INVENTION

One aspect of the instant disclosure relates to a zipper head assembly structure and a sliding assembly thereof.

One of the embodiments of the instant disclosure provides a zipper head assembly structure, comprising a sliding assembly and a pulling member. The sliding assembly has a base portion, a first lateral wall portion, a second lateral wall portion, a seat portion, a cover sheet, a spring component, and a retaining member. The first lateral wall portion and the second lateral wall portion are respectively extended upwardly from two opposite lateral sides of the base portion, the first lateral wall portion and the second lateral wall portion correspond to each other and are connected to a front side portion of the base portion, the seat portion is disposed on the base portion and is connected to a rear side portion of the base portion, the seat portion has a positioning through hole formed between the first lateral wall portion and the second lateral wall portion, the cover sheet is disposed on the seat portion, the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, the retaining member is movably disposed on the seat portion and movably contacts the spring component, and the retaining member has a positioning portion disposed on an end portion thereof and passing through the positioning through hole. The pulling member is movably mated with the retaining member. More particularly, the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member.

More particularly, the first lateral wall portion has a first inner surface and a first outer surface opposite to the first inner surface, the second lateral wall portion has a second inner surface corresponding to the first inner surface and a second outer surface opposite to the second inner surface, a first thickness between the first inner surface and the first outer surface of the first lateral wall portion is smaller than a second thickness between the second inner surface and the second outer surface of the second lateral wall portion. The base portion has a first symmetric center line, the seat portion has a second symmetric center line, the first symmetric center line passes through a geometric center point of the positioning through hole, the second symmetric center line of the seat portion is horizontally moved relative to the first symmetric center line of the base portion by a predetermined horizontal offset and along a horizontal direction from the second lateral wall portion to the first lateral wall portion. The retaining member has an embedded portion opposite to the positioning portion and disposed inside a receiving groove of the seat portion and a concave abutting portion disposed between the positioning portion and the embedded portion and directly contacting the first contacting side of the spring component, and the first end portion of the cover sheet has a position-limiting groove for receiving the second contacting side of the spring component.

Another one of the embodiments of the instant disclosure provides a sliding assembly comprising a base portion, a first lateral wall portion, a second lateral wall portion, a seat portion, a cover sheet, a spring component, and a retaining member. The first lateral wall portion and the second lateral wall portion are respectively extended upwardly from two opposite lateral sides of the base portion, the first lateral wall portion and the second lateral wall portion correspond to each other and are connected to a front side portion of the base portion, the seat portion is disposed on the base portion and is connected to a rear side portion of the base portion, the seat portion has a positioning through hole formed between the first lateral wall portion and the second lateral wall portion, the cover sheet is disposed on the seat portion, the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, the retaining member is movably disposed on the seat portion and movably contacts the spring component, and the retaining member has a positioning portion disposed on an end portion thereof and passing through the positioning through hole. More particularly, the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member.

Yet another one of the embodiments of the instant disclosure provides a zipper head assembly structure, comprising a sliding assembly and a pulling member. The sliding assembly has a base portion, a seat portion, a cover sheet, a spring component, and a retaining member. The seat portion is disposed on the base portion, the seat portion has a positioning through hole, the cover sheet is disposed on the seat portion, the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, the retaining member is movably disposed on the seat portion and movably contacts the spring component, and the retaining member has a positioning portion disposed on an end portion thereof and passing through the positioning through hole. The pulling member is movably mated with the retaining member. More particularly, the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member.

More particularly, the zipper head assembly structure is disposed on a zipper teeth structure including a first zipper teeth member and a second zipper teeth member mated with each other, the first zipper teeth member includes a first zipper teeth carrier and a plurality of first zipper teeth disposed on the first zipper teeth carrier, the second zipper teeth member includes a second zipper teeth carrier and a plurality of second zipper teeth disposed on the second zipper teeth carrier, and one of the first zipper teeth is retained between two of the second zipper teeth to form a gap for receiving the positioning portion.

Therefore, the cover sheet is disposed on the seat portion, and the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, so that the retaining member can be movably disposed on the seat portion for movably contacting the spring component.

More particularly, the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member, so that the spring component can be fixedly disposed inside the seat portion and between the cover sheet and the retaining member, so as to prevent the spring component from being separated from between the cover sheet and the retaining member.

To further understand the techniques, means and effects of the instant disclosure applied for achieving the prescribed objectives, the following detailed descriptions and appended drawings are hereby referred to, such that, and through which, the purposes, features and aspects of the instant disclosure can be thoroughly and concretely appreciated. However, the appended drawings are provided solely for reference and illustration, without any intention to limit the instant disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective, exploded, schematic view of the sliding assembly according to one of embodiments of the instant disclosure;

FIG. 2 shows a perspective, assembled, schematic view of the sliding assembly according to one of embodiments of the instant disclosure;

FIG. 3 shows a cross-sectional view taken along the section line III-III of FIG. 2;

FIG. 4 shows a cross-sectional view taken along the section line IV-IV of FIG. 2;

FIG. 5 shows a front, schematic view of the sliding assembly according to the instant disclosure;

FIG. 6 shows a perspective, schematic view of the retaining member of a sliding assembly according to the instant disclosure;

FIG. 7 shows a perspective, schematic view of the zipper head assembly structure according to one of embodiments of the instant disclosure;

FIG. 8 shows a partial, a cross-sectional, schematic view of the zipper head assembly structure before upwardly pulling the retaining member by the pulling member according to the instant disclosure;

FIG. 9 shows a partial, a cross-sectional, schematic view of the zipper head assembly structure after upwardly pulling the retaining member by the pulling member according to the instant disclosure;

FIG. 10 shows a top, schematic view of the zipper head assembly structure slidably disposed on the zipper teeth structure according to the instant disclosure; and

FIG. 11 shows an enlarged, schematic view of the positioning portion inserted into a gap between two adjacent second zipper teeth.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The embodiments of “a zipper head assembly structure and a sliding assembly thereof” of the instant disclosure are described. Other advantages and objectives of the instant disclosure can be easily understood by one skilled in the art from the disclosure. The instant disclosure can be applied in different embodiments. Various modifications and variations can be made to various details in the description for different applications without departing from the scope of the instant disclosure. The drawings of the instant disclosure are provided only for simple illustrations, but are not drawn to scale and do not reflect the actual relative dimensions. The following embodiments are provided to describe in detail the concept of the instant disclosure, and are not intended to limit the scope thereof in any way.

Referring to FIG. 1 to FIG. 6, one of embodiments of the instant disclosure provides a sliding assembly 1 (such as a sliding head, or a slide fastener head), and the sliding assembly 1 comprises a base portion 10, a first lateral wall portion 11, a second lateral wall portion 12, a seat portion 13, a retaining member 14 (such as a hook body or a horse-like hook), a spring component 15, and a cover sheet 16.

First, referring to FIG. 1 to FIG. 3, the first lateral wall portion 11 and the second lateral wall portion 12 are respectively extended upwardly from two opposite lateral sides of the base portion 10, and the first lateral wall portion 11 and the second lateral wall portion 12 correspond to each other and are connected to a front side portion 101 of the base portion 10. The seat portion 13 is disposed on the base portion 10 and is connected to a rear side portion 102 of the base portion 10, and the seat portion 13 has a positioning through hole 130 formed between the first lateral wall portion 11 and the second lateral wall portion 12. The cover sheet 16 is fixedly disposed on the seat portion 13, and the spring component 15 is disposed inside the seat portion 13 and between the cover sheet 16 and the retaining member 14. The retaining member 14 is movably disposed on the seat portion 13 and movably contacts the spring component 15, and the retaining member 14 has a positioning portion 140 disposed on an end portion thereof and passing through the positioning through hole 130.

More particularly, referring to FIG. 1 to FIG. 3, the spring component 15 has a first contacting side 151 directly contacting the retaining member 14 and a second contacting side 152 opposite to the first contacting side 151, and the cover sheet 16 has a first end portion 161 directly contacting the second contacting side 152 of the spring component 15 and a second end portion 162 opposite to the first end portion 161 and separated from the retaining member 14. That is to say, the cover sheet 16 cannot directly contact any portion of the retaining member 14. In addition, the retaining member 14 has an embedded portion 141 opposite to the positioning portion 140 and disposed inside a receiving groove 131 of the seat portion 13 and a concave abutting portion 142 disposed between the positioning portion 140 and the embedded portion 141 and directly contacting the first contacting side 151 of the spring component 15, and the first end portion 161 of the cover sheet 16 has a position-limiting groove 1610 for receiving the second contacting side 152 of the spring component 15. Please note, as shown in FIG. 3, the embedded portion 141 of the retaining member 14 is downwardly pressed by the spring component 15, so as to keep the embedded portion 141 of the retaining member 14 to be received inside receiving groove 131. Hence, the retaining member 14 can be moved downwardly (as shown in FIG. 8) or upwardly (as shown in FIG. 9) relative to the embedded portion 141 as a rotary shaft.

More particularly, referring to FIG. 4 and FIG. 5, the first lateral wall portion 11 has a first inner surface 111 and a first outer surface 112 opposite to (oppositely arranged to) the first inner surface 111, and the second lateral wall portion 12 has a second inner surface 121 corresponding to the first inner surface 111 and a second outer surface 122 opposite to the second inner surface 121. In addition, a first thickness H1 between the first inner surface 111 and the first outer surface 112 of the first lateral wall portion 11 is smaller than a second thickness H2 between the second inner surface 121 and the second outer surface 122 of the second lateral wall portion 12.

For example, the first inner surface 111 of the first lateral wall portion 11 is divided into a first primary inner surface 1111 and a first secondary inner surface 1112, and the second inner surface 121 of the second lateral wall portion 12 is divided into a second primary inner surface 1211 facing the first primary inner surface 1111 and a second secondary inner surface 1212 facing the first secondary inner surface 1112. In addition, a first primary thickness H11 between the first primary inner surface 1111 and the first outer surface 112 of the first lateral wall portion 11 is smaller than a second primary thickness H21 between the second primary inner surface 1211 and the second outer surface 122 of the second lateral wall portion 12, and a first secondary thickness H12 between the first secondary inner surface 1112 and the first outer surface 112 of the first lateral wall portion 11 is smaller than a second secondary thickness H22 between the second secondary inner surface 1212 and the second outer surface 122 of the second lateral wall portion 12.

More particularly, referring to FIG. 4 and FIG. 5, the base portion 10 has a first symmetric center line L1 (i.e., a symmetry centerline or a symmetrical central line), and the seat portion 13 has a second symmetric center line L2. The first symmetric center line L1 can pass through a geometric center point P (as shown in FIG. 4) of the positioning through hole 130, and the second symmetric center line L2 of the seat portion 13 is horizontally moved relative to the first symmetric center line L1 of the base portion 10 by a predetermined horizontal offset S and along a horizontal direction from the second lateral wall portion 12 to the first lateral wall portion 11. For example, the predetermined horizontal offset S from the second symmetric center line L2 of the seat portion 13 to the first symmetric center line L1 of the base portion 10 can conform to the following formula: S=(H2−H1)/2, in which S is the predetermined horizontal offset, H1 is the first thickness, and H2 is the second thickness.

As shown in FIG. 4 or FIG. 5, it is worth mentioning that when the first symmetric center line L1 is used as a symmetrical baseline, the first outer surface 112 of the first lateral wall portion 11 and the second outer surface 122 of the second lateral wall portion 12 are symmetrically disposed relative to the first symmetric center line L1 (i.e., the first outer surface 112 and the second outer surface 122 are symmetrically disposed on opposite sides of the first symmetric center line L1). In addition, when the second symmetric center line L2 is used as a symmetrical baseline, the first primary inner surface 1111 of the first inner surface 111 of the first lateral wall portion 11 and the second primary inner surface 1211 of the second inner surface 121 of the second lateral wall portion 12 are symmetrically disposed relative to the second symmetric center line L2 (i.e., the first primary inner surface 1111 and the second primary inner surface 1211 are symmetrically disposed on opposite sides of the second symmetric center line L2), or the first secondary inner surface 1112 of the first inner surface 111 of the first lateral wall portion 11 and the second secondary inner surface 1212 of the second inner surface 121 of the second lateral wall portion 12 are symmetrically disposed relative to the second symmetric center line L2 (i.e., the first secondary inner surface 1112 and the second secondary inner surface 1212 are symmetrically disposed on opposite sides of the second symmetric center line L2).

Furthermore, referring to FIG. 4, FIG. 5, and FIG. 6, the positioning portion 140 of the retaining member 14 has a cutting edge 1400 (such as a cutting plane) concaved on a lateral surface thereof and along an opposite direction opposite to the horizontal direction from the second lateral wall portion 12 to the first lateral wall portion 11, so that the positioning portion 140 is diverged (deviated) from the second symmetric center line L2 and adjacent to the first symmetric center line L1 (as shown in FIG. 5).

Referring to FIG. 7 to FIG. 11, one of embodiments of the instant disclosure provides a zipper head assembly structure Z disposed on a zipper teeth structure 3 (such as a zipper tape or a zipper strip) including a first zipper teeth member 31 (such as a zipper rack or a toothed bar) and a second zipper teeth member 32 mated with each other. The zipper head assembly structure Z comprises a sliding assembly 1 and a pulling member 2 (such as a pull tab or a pull piece).

Referring to FIG. 1, FIG. 7 and FIG. 10, the first lateral wall portion 11 and the second lateral wall portion 12 are respectively extended upwardly from two opposite lateral sides of the base portion 10, and the first lateral wall portion 11 and the second lateral wall portion 12 correspond to each other and are connected to a front side portion 101 of the base portion 10. The seat portion 13 is disposed on the base portion 10 and is connected to a rear side portion 102 of the base portion 10, and the seat portion 13 has a positioning through hole 130 formed between the first lateral wall portion 11 and the second lateral wall portion 12. The cover sheet 16 is fixedly disposed on the seat portion 13, and the spring component 15 is disposed inside the seat portion 13 and between the cover sheet 16 and the retaining member 14. The retaining member 14 is movably disposed on the seat portion 13 and movably contacts the spring component 15, and the retaining member 14 has a positioning portion 140 disposed on an end portion thereof and passing through the positioning through hole 130. In addition, the pulling member 2 is movably mated with the retaining member 14, for example, the pulling member 2 includes a movable piece 21 disposed on an end portion 20 thereof and movably mated with the retaining member 14.

More particularly, referring to FIG. 10 and FIG. 11, the first zipper teeth member 31 includes a first zipper teeth carrier 310 and a plurality of first zipper teeth 311 disposed on the first zipper teeth carrier 310, and the second zipper teeth member 32 includes a second zipper teeth carrier 320 and a plurality of second zipper teeth 321 disposed on the second zipper teeth carrier 320. In addition, as shown in FIG. 11, each of the first zipper teeth 311 can be retained between two adjacent second zipper teeth 321. When one of the first zipper teeth 311 is retained between two of the second zipper teeth 321 to form a gap P between the first zipper tooth 311 and the two second zipper teeth 321 for receiving the positioning portion 140 (i.e., the positioning portion 140 is inserted into the gap (g) between the two adjacent second zipper teeth 321), the zipper head assembly structure Z can be accurately positioned on the zipper teeth structure 3 by matching the positioning portion 140 and the gap (g).

In conclusion, the cover sheet 16 is disposed on the seat portion 13, and the spring component 15 is disposed inside the seat portion 13 and between the cover sheet 16 and the retaining member 14, so that the retaining member 14 can be movably disposed on the seat portion 13 for movably contacting the spring component 15.

More particularly, the spring component 15 has a first contacting side 151 directly contacting the retaining member 14 and a second contacting side 152 opposite to the first contacting side 151, and the cover sheet 16 has a first end portion 161 directly contacting the second contacting side 152 of the spring component 15 and a second end portion 162 opposite to the first end portion 161 and separated from the retaining member 14, so that the spring component 15 can be fixedly disposed inside the seat portion 13 and between the cover sheet 16 and the retaining member 14, so as to prevent the spring component 15 from being separated from between the cover sheet 16 and the retaining member 14.

The aforementioned descriptions merely represent the preferred embodiments of the instant disclosure, without any intention to limit the scope of the instant disclosure which is fully described only within the following claims. Various equivalent changes, alterations or modifications based on the claims of the instant disclosure are all, consequently, viewed as being embraced by the scope of the instant disclosure. 

What is claimed is:
 1. A zipper head assembly structure, comprising: a sliding assembly having a base portion, a first lateral wall portion, a second lateral wall portion, a seat portion, a cover sheet, a spring component, and a retaining member, wherein the first lateral wall portion and the second lateral wall portion are respectively extended upwardly from two opposite lateral sides of the base portion, the first lateral wall portion and the second lateral wall portion correspond to each other and are connected to a front side portion of the base portion, the seat portion is disposed on the base portion and is connected to a rear side portion of the base portion, the seat portion has a positioning through hole formed between the first lateral wall portion and the second lateral wall portion, the cover sheet is disposed on the seat portion, the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, the retaining member is movably disposed on the seat portion and movably contacts the spring component, and the retaining member has a positioning portion disposed on an end portion thereof and passing through the positioning through hole; and a pulling member movably mated with the retaining member; wherein the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member.
 2. The zipper head assembly structure of claim 1, wherein the first lateral wall portion has a first inner surface and a first outer surface opposite to the first inner surface, the second lateral wall portion has a second inner surface corresponding to the first inner surface and a second outer surface opposite to the second inner surface, a first thickness between the first inner surface and the first outer surface of the first lateral wall portion is smaller than a second thickness between the second inner surface and the second outer surface of the second lateral wall portion, wherein the base portion has a first symmetric center line, the seat portion has a second symmetric center line, the first symmetric center line passes through a geometric center point of the positioning through hole, the second symmetric center line of the seat portion is horizontally moved relative to the first symmetric center line of the base portion by a predetermined horizontal offset and along a horizontal direction from the second lateral wall portion to the first lateral wall portion, wherein the retaining member has an embedded portion opposite to the positioning portion and disposed inside a receiving groove of the seat portion and a concave abutting portion disposed between the positioning portion and the embedded portion and directly contacting the first contacting side of the spring component, and the first end portion of the cover sheet has a position-limiting groove for receiving the second contacting side of the spring component.
 3. The zipper head assembly structure of claim 2, wherein the predetermined horizontal offset from the second symmetric center line of the seat portion to the first symmetric center line of the base portion conforms to the following formula: S=(H2−H1)/2, wherein S is the predetermined horizontal offset, H1 is the first thickness, and H2 is the second thickness, wherein the first outer surface of the first lateral wall portion and the second outer surface of the second lateral wall portion are symmetrically disposed relative to the first symmetric center line, the first inner surface of the first lateral wall portion and the second inner surface of the second lateral wall portion are symmetrically disposed relative to the second symmetric center line, wherein the positioning portion of the retaining member has a cutting edge concaved on a lateral surface thereof and along an opposite direction opposite to the horizontal direction, so that the positioning portion is diverged from the second symmetric center line and adjacent to the first symmetric center line, wherein the first inner surface of the first lateral wall portion is divided into a first primary inner surface and a first secondary inner surface, and the second inner surface of the second lateral wall portion is divided into a second primary inner surface facing the first primary inner surface and a second secondary inner surface facing the first secondary inner surface, wherein a first primary thickness between the first primary inner surface and the first outer surface of the first lateral wall portion is smaller than a second primary thickness between the second primary inner surface and the second outer surface of the second lateral wall portion, and a first secondary thickness between the first secondary inner surface and the first outer surface of the first lateral wall portion is smaller than a second secondary thickness between the second secondary inner surface and the second outer surface of the second lateral wall portion.
 4. A sliding assembly comprising: a base portion, a first lateral wall portion, a second lateral wall portion, a seat portion, a cover sheet, a spring component, and a retaining member, wherein the first lateral wall portion and the second lateral wall portion are respectively extended upwardly from two opposite lateral sides of the base portion, the first lateral wall portion and the second lateral wall portion correspond to each other and are connected to a front side portion of the base portion, the seat portion is disposed on the base portion and is connected to a rear side portion of the base portion, the seat portion has a positioning through hole formed between the first lateral wall portion and the second lateral wall portion, the cover sheet is disposed on the seat portion, the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, the retaining member is movably disposed on the seat portion and movably contacts the spring component, and the retaining member has a positioning portion disposed on an end portion thereof and passing through the positioning through hole; wherein the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member.
 5. The sliding assembly of claim 4, wherein the first lateral wall portion has a first inner surface and a first outer surface opposite to the first inner surface, the second lateral wall portion has a second inner surface corresponding to the first inner surface and a second outer surface opposite to the second inner surface, a first thickness between the first inner surface and the first outer surface of the first lateral wall portion is smaller than a second thickness between the second inner surface and the second outer surface of the second lateral wall portion, wherein the base portion has a first symmetric center line, the seat portion has a second symmetric center line, the first symmetric center line passes through a geometric center point of the positioning through hole, the second symmetric center line of the seat portion is horizontally moved relative to the first symmetric center line of the base portion by a predetermined horizontal offset and along a horizontal direction from the second lateral wall portion to the first lateral wall portion, wherein the retaining member has an embedded portion opposite to the positioning portion and disposed inside a receiving groove of the seat portion and a concave abutting portion disposed between the positioning portion and the embedded portion and directly contacting the first contacting side of the spring component, and the first end portion of the cover sheet has a position-limiting groove for receiving the second contacting side of the spring component.
 6. The sliding assembly of claim 5, wherein the predetermined horizontal offset from the second symmetric center line of the seat portion to the first symmetric center line of the base portion conforms to the following formula: S=(H2−H1)/2, wherein S is the predetermined horizontal offset, H1 is the first thickness, and H2 is the second thickness, wherein the first outer surface of the first lateral wall portion and the second outer surface of the second lateral wall portion are symmetrically disposed relative to the first symmetric center line, the first inner surface of the first lateral wall portion and the second inner surface of the second lateral wall portion are symmetrically disposed relative to the second symmetric center line, wherein the positioning portion of the retaining member has a cutting edge concaved on a lateral surface thereof and along an opposite direction opposite to the horizontal direction, so that the positioning portion is diverged from the second symmetric center line and adjacent to the first symmetric center line, wherein the first inner surface of the first lateral wall portion is divided into a first primary inner surface and a first secondary inner surface, and the second inner surface of the second lateral wall portion is divided into a second primary inner surface facing the first primary inner surface and a second secondary inner surface facing the first secondary inner surface, wherein a first primary thickness between the first primary inner surface and the first outer surface of the first lateral wall portion is smaller than a second primary thickness between the second primary inner surface and the second outer surface of the second lateral wall portion, and a first secondary thickness between the first secondary inner surface and the first outer surface of the first lateral wall portion is smaller than a second secondary thickness between the second secondary inner surface and the second outer surface of the second lateral wall portion.
 7. A zipper head assembly structure, comprising: a sliding assembly having a base portion, a seat portion, a cover sheet, a spring component, and a retaining member, wherein the seat portion is disposed on the base portion, the seat portion has a positioning through hole, the cover sheet is disposed on the seat portion, the spring component is disposed inside the seat portion and between the cover sheet and the retaining member, the retaining member is movably disposed on the seat portion and movably contacts the spring component, and the retaining member has a positioning portion disposed on an end portion thereof and passing through the positioning through hole; and a pulling member movably mated with the retaining member; wherein the spring component has a first contacting side directly contacting the retaining member and a second contacting side opposite to the first contacting side, and the cover sheet has a first end portion directly contacting the second contacting side of the spring component and a second end portion opposite to the first end portion and separated from the retaining member.
 8. The zipper head assembly structure of claim 7, wherein the base portion has a first symmetric center line, the seat portion has a second symmetric center line, the first symmetric center line passes through a geometric center point of the positioning through hole, the second symmetric center line of the seat portion is horizontally moved relative to the first symmetric center line of the base portion by a predetermined horizontal offset and along a horizontal direction, wherein the retaining member has an embedded portion opposite to the positioning portion and disposed inside a receiving groove of the seat portion and a concave abutting portion disposed between the positioning portion and the embedded portion and directly contacting the first contacting side of the spring component, and the first end portion of the cover sheet has a position-limiting groove for receiving the second contacting side of the spring component.
 9. The zipper head assembly structure of claim 8, wherein the positioning portion of the retaining member has a cutting edge concaved on a lateral surface thereof and along an opposite direction opposite to the horizontal direction, so that the positioning portion is diverged from the second symmetric center line and adjacent to the first symmetric center line.
 10. The zipper head assembly structure of claim 7, wherein the zipper head assembly structure is disposed on a zipper teeth structure including a first zipper teeth member and a second zipper teeth member mated with each other, the first zipper teeth member includes a first zipper teeth carrier and a plurality of first zipper teeth disposed on the first zipper teeth carrier, the second zipper teeth member includes a second zipper teeth carrier and a plurality of second zipper teeth disposed on the second zipper teeth carrier, and one of the first zipper teeth is retained between two of the second zipper teeth to form a gap for receiving the positioning portion. 